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Apparatus and method for slicing RF signal and compensating for the slice level of RF signal in disk drive

a disk drive and signal technology, applied in pulse technique, digital signal error detection/correction, dc level restoring means or bias distortion correction, etc., can solve problems such as block error rate and information on the disk not being normally reproduced, and achieve the effect of minimizing the block error ra

Inactive Publication Date: 2008-05-06
TS OPTICS CORP
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Benefits of technology

[0008]To solve the above-described problems, it is an object of the present invention to provide an apparatus and method for slicing an RF signal and compensating for the slice level of an RF signal, which is capable of minimizing a block error rate by optimizing the slice level of an RF signal in accordance with a variation in the symmetry of the RF signal.

Problems solved by technology

Accordingly, if the degree of symmetry of an RF signal recorded on a disk is too high or the beta value of the RF signal is very low due to errors in disk mastering or recording, the information on the disk may not be normally reproduced and various errors may be caused that increase a block error rate.

Method used

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  • Apparatus and method for slicing RF signal and compensating for the slice level of RF signal in disk drive

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Embodiment Construction

[0019]Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The example embodiments are described below to explain the present invention by referring to the figures.

[0020]Referring to FIG. 2, an apparatus for slicing an RF signal includes a comparator 201, a first low-pass filter (LPF) 202, and a slice level compensator 210. The slice level compensator 210 includes a second low-pass filter 211, a bottom holder 212, a peak holder 213, a controller 214, and a slice level adjustor 215. The comparator 201 and the first low-pass filter 202 have the same structure and operation as the comparator 101 and the low-pass filter 102, respectively, shown in FIG. 1, and thus their descriptions will be omitted.

[0021]The second low-pass filter 211 filters an RF signal reproduced from a disk (not shown) and provides data ...

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Abstract

An apparatus and method for slicing an RF signal and compensating for the slice level of an RF signal reproduced from a disk, which minimizes a block error rate by optimizing the slice level of the RF signal according to variations in symmetry of the RF signal when slicing the RF signal. A comparator converts the RF signal reproduced from the disk into a digital signal by comparing the RF signal with a slice level, a low-pass filter low-pass filters the digital signal and provides the result to the comparator as the slice level, and a slice level compensator compensates for the slice level provided to the comparator by the low-pass filter according to variations in symmetry of the RF signal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Korean Patent Application No. 2001-19263, filed on Apr. 11, 2001, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an apparatus and method for slicing a radio frequency (RF) signal in a disk drive, and more particularly, to an apparatus and method for slicing a disk drive RF signal and compensating for the slice level of the RF signal, which is capable of optimizing the slice level of the RF signal in accordance with variation in the symmetry of the RF signal.[0004]2. Description of the Related Art[0005]Disk drives are devices for reproducing data recorded on a disk, such as CD-DA / ROM / R / RW or DVD-ROM / R / RW / RAM, or recording data on the disk. Such disk drives include an apparatus for slicing an RF signal, which converts an RF signal reproduced from a di...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H03K9/00G11B20/10G11B27/02G11B7/005G11B20/18H04L25/06
CPCH04L25/062G11B20/18
Inventor KIM, JOO-YEUPGO, SUNG-RO
Owner TS OPTICS CORP
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